def work(self, **kwargs):
self.__dict__.update(kwargs)
bandit = opt_q_uniform(self.target)
prior_weight = 2.5
gamma = 0.20
algo = TreeParzenEstimator(bandit,
prior_weight=prior_weight,
n_startup_jobs=2,
n_EI_candidates=128,
gamma=gamma)
print algo.opt_idxs['x']
print algo.opt_vals['x']
trials = Trials()
experiment = Experiment(trials, algo)
experiment.run(self.LEN)
if self.show_vars:
import hyperopt.plotting
hyperopt.plotting.main_plot_vars(trials, bandit, do_show=1)
idxs, vals = miscs_to_idxs_vals(trials.miscs)
idxs = idxs['x']
vals = vals['x']
print "VALS", vals
losses = trials.losses()
from hyperopt.tpe import ap_filter_trials
from hyperopt.tpe import adaptive_parzen_samplers
qu = scope.quniform(1.01, 10, 1)
fn = adaptive_parzen_samplers['quniform']
fn_kwargs = dict(size=(4, ), rng=np.random)
s_below = pyll.Literal()
s_above = pyll.Literal()
b_args = [s_below, prior_weight] + qu.pos_args
b_post = fn(*b_args, **fn_kwargs)
a_args = [s_above, prior_weight] + qu.pos_args
a_post = fn(*a_args, **fn_kwargs)
#print b_post
#print a_post
fn_lpdf = getattr(scope, a_post.name + '_lpdf')
print fn_lpdf
# calculate the llik of b_post under both distributions
a_kwargs = dict([(n, a) for n, a in a_post.named_args
if n not in ('rng', 'size')])
b_kwargs = dict([(n, a) for n, a in b_post.named_args
if n not in ('rng', 'size')])
below_llik = fn_lpdf(*([b_post] + b_post.pos_args), **b_kwargs)
above_llik = fn_lpdf(*([b_post] + a_post.pos_args), **a_kwargs)
new_node = scope.broadcast_best(b_post, below_llik, above_llik)
print '=' * 80
do_show = self.show_steps
import matplotlib.pyplot as plt
for ii in range(2, 9):
if ii > len(idxs):
break
print '-' * 80
print 'ROUND', ii
print '-' * 80
all_vals = [2, 3, 4, 5, 6, 7, 8, 9, 10]
below, above = ap_filter_trials(idxs[:ii], vals[:ii], idxs[:ii],
losses[:ii], gamma)
below = below.astype('int')
above = above.astype('int')
print 'BB0', below
print 'BB1', above
#print 'BELOW', zip(range(100), np.bincount(below, minlength=11))
#print 'ABOVE', zip(range(100), np.bincount(above, minlength=11))
memo = {b_post: all_vals, s_below: below, s_above: above}
bl, al, nv = pyll.rec_eval([below_llik, above_llik, new_node],
memo=memo)
#print bl - al
print 'BB2', dict(zip(all_vals, bl - al))
print 'BB3', dict(zip(all_vals, bl))
print 'BB4', dict(zip(all_vals, al))
print 'ORIG PICKED', vals[ii]
print 'PROPER OPT PICKS:', nv
#assert np.allclose(below, [3, 3, 9])
#assert len(below) + len(above) == len(vals)
if do_show:
plt.subplot(8, 1, ii)
#plt.scatter(all_vals,
# np.bincount(below, minlength=11)[2:], c='b')
#plt.scatter(all_vals,
# np.bincount(above, minlength=11)[2:], c='c')
plt.scatter(all_vals, bl, c='g')
plt.scatter(all_vals, al, c='r')
if do_show:
plt.show()
def build_posterior(specs, prior_idxs, prior_vals, obs_idxs, obs_vals,
oloss_idxs, oloss_vals, oloss_gamma, prior_weight):
"""
This method clones a posterior inference graph by iterating forward in
topological order, and replacing prior random-variables (prior_vals) with
new posterior distributions that make use of observations (obs_vals).
"""
assert all(isinstance(arg, pyll.Apply)
for arg in [oloss_idxs, oloss_vals, oloss_gamma])
expr = pyll.as_apply([specs, prior_idxs, prior_vals])
nodes = pyll.dfs(expr)
# build the joint posterior distribution as the values in this memo
memo = {}
# map prior RVs to observations
obs_memo = {}
for nid in prior_vals:
# construct the leading args for each call to adaptive_parzen_sampler
# which will permit the "adaptive parzen samplers" to adapt to the
# correct samples.
obs_below, obs_above = scope.ap_filter_trials(
obs_idxs[nid], obs_vals[nid],
oloss_idxs, oloss_vals, oloss_gamma)
obs_memo[prior_vals[nid]] = [obs_below, obs_above]
for node in nodes:
if node not in memo:
new_inputs = [memo[arg] for arg in node.inputs()]
if node in obs_memo:
# -- this case corresponds to an observed Random Var
# node.name is a distribution like "normal", "randint", etc.
obs_below, obs_above = obs_memo[node]
aa = [memo[a] for a in node.pos_args]
fn = adaptive_parzen_samplers[node.name]
b_args = [obs_below, prior_weight] + aa
named_args = [[kw, memo[arg]]
for (kw, arg) in node.named_args]
b_post = fn(*b_args, **dict(named_args))
a_args = [obs_above, prior_weight] + aa
a_post = fn(*a_args, **dict(named_args))
assert a_post.name == b_post.name
fn_lpdf = getattr(scope, a_post.name + '_lpdf')
#print fn_lpdf
a_kwargs = dict([(n, a) for n, a in a_post.named_args
if n not in ('rng', 'size')])
b_kwargs = dict([(n, a) for n, a in b_post.named_args
if n not in ('rng', 'size')])
# calculate the llik of b_post under both distributions
below_llik = fn_lpdf(*([b_post] + b_post.pos_args), **b_kwargs)
above_llik = fn_lpdf(*([b_post] + a_post.pos_args), **a_kwargs)
#improvement = below_llik - above_llik
#new_node = scope.broadcast_best(b_post, improvement)
new_node = scope.broadcast_best(b_post, below_llik, above_llik)
elif hasattr(node, 'obj'):
# -- keep same literals in the graph
new_node = node
else:
# -- this case is for all the other stuff in the graph
new_node = node.clone_from_inputs(new_inputs)
memo[node] = new_node
post_specs = memo[specs]
post_idxs = dict([(nid, memo[idxs])
for nid, idxs in prior_idxs.items()])
post_vals = dict([(nid, memo[vals])
for nid, vals in prior_vals.items()])
assert set(post_idxs.keys()) == set(post_vals.keys())
assert set(post_idxs.keys()) == set(prior_idxs.keys())
return post_specs, post_idxs, post_vals
def work(self, **kwargs):
self.__dict__.update(kwargs)
bandit = opt_q_uniform(self.target)
prior_weight = 2.5
gamma = 0.20
algo = TreeParzenEstimator(bandit,
prior_weight=prior_weight,
n_startup_jobs=2,
n_EI_candidates=128,
gamma=gamma)
print algo.opt_idxs['x']
print algo.opt_vals['x']
trials = Trials()
experiment = Experiment(trials, algo)
experiment.run(self.LEN)
if self.show_vars:
import hyperopt.plotting
hyperopt.plotting.main_plot_vars(trials, bandit, do_show=1)
idxs, vals = miscs_to_idxs_vals(trials.miscs)
idxs = idxs['x']
vals = vals['x']
print "VALS", vals
losses = trials.losses()
from hyperopt.tpe import ap_filter_trials
from hyperopt.tpe import adaptive_parzen_samplers
qu = scope.quniform(1.01, 10, 1)
fn = adaptive_parzen_samplers['quniform']
fn_kwargs = dict(size=(4,), rng=np.random)
s_below = pyll.Literal()
s_above = pyll.Literal()
b_args = [s_below, prior_weight] + qu.pos_args
b_post = fn(*b_args, **fn_kwargs)
a_args = [s_above, prior_weight] + qu.pos_args
a_post = fn(*a_args, **fn_kwargs)
#print b_post
#print a_post
fn_lpdf = getattr(scope, a_post.name + '_lpdf')
print fn_lpdf
# calculate the llik of b_post under both distributions
a_kwargs = dict([(n, a) for n, a in a_post.named_args
if n not in ('rng', 'size')])
b_kwargs = dict([(n, a) for n, a in b_post.named_args
if n not in ('rng', 'size')])
below_llik = fn_lpdf(*([b_post] + b_post.pos_args), **b_kwargs)
above_llik = fn_lpdf(*([b_post] + a_post.pos_args), **a_kwargs)
new_node = scope.broadcast_best(b_post, below_llik, above_llik)
print '=' * 80
do_show = self.show_steps
import matplotlib.pyplot as plt
for ii in range(2, 9):
if ii > len(idxs):
break
print '-' * 80
print 'ROUND', ii
print '-' * 80
all_vals = [2, 3, 4, 5, 6, 7, 8, 9, 10]
below, above = ap_filter_trials(idxs[:ii],
vals[:ii], idxs[:ii], losses[:ii], gamma)
below = below.astype('int')
above = above.astype('int')
print 'BB0', below
print 'BB1', above
#print 'BELOW', zip(range(100), np.bincount(below, minlength=11))
#print 'ABOVE', zip(range(100), np.bincount(above, minlength=11))
memo = {b_post: all_vals, s_below: below, s_above: above}
bl, al, nv = pyll.rec_eval([below_llik, above_llik, new_node],
memo=memo)
#print bl - al
print 'BB2', dict(zip(all_vals, bl - al))
print 'BB3', dict(zip(all_vals, bl))
print 'BB4', dict(zip(all_vals, al))
print 'ORIG PICKED', vals[ii]
print 'PROPER OPT PICKS:', nv
#assert np.allclose(below, [3, 3, 9])
#assert len(below) + len(above) == len(vals)
if do_show:
plt.subplot(8, 1, ii)
#plt.scatter(all_vals,
# np.bincount(below, minlength=11)[2:], c='b')
#plt.scatter(all_vals,
# np.bincount(above, minlength=11)[2:], c='c')
plt.scatter(all_vals, bl, c='g')
plt.scatter(all_vals, al, c='r')
if do_show:
plt.show()
